JP2011126325A - Tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tractor for effectively dispersing a force applied from a front portion of a working machine. <P>SOLUTION: The tractor includes a main frame 12, a working machine support 30, and a rear frame 13. The working machine support 30 is attached to the main frame 12 to support a front loader attached to a front portion of a vehicle body. The rear frame 13 has a front end portion fixed to the working machine support 30, and a rear end portion fixed to a rear axle case or the main frame 12 and positioned lower than the main frame 12 in a side view. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tractor capable of mounting a work machine in front of a vehicle body.

  2. Description of the Related Art Conventionally, a tractor capable of attaching a work machine such as a loader to the front portion of a vehicle body is known. When a work machine (front work machine) is attached to the front part of the tractor to perform work, it is assumed that a load and an impact from the front work machine are applied to the vehicle body. For example, when a torsional moment in the left-right direction is applied to the vehicle body from the front work machine during work, this torsional moment applies a load to the main frame supporting the attachment part via the attachment part of the work machine. . In order to reduce this load, a configuration in which a rear frame is provided outside the main frame in the lateral direction of the vehicle body is conventionally known. Patent Document 1 discloses a tractor provided with this type of rear frame.

  As for the rear frame with which the tractor of patent documents 1 is provided, the front end part is attached to the attachment part of a front work machine, and the rear end part is attached to the main frame. Further, the rear frame is disposed at substantially the same height as the main frame in a side view. By providing the rear frame, for example, the torsional moment can be dispersed not only in the main frame but also in the rear frame.

Japanese Patent No. 3908486

  By the way, when the work is performed with the front work machine attached, a force other than the torsional moment may be applied to the vehicle body. For example, when the loader is raised or lowered, a strong rotational moment acts on the mounting portion of the front work implement. However, with respect to such a rotational moment, the configuration of Patent Document 1 cannot sufficiently distribute the load to the rear frame, and the load on the main frame is large. Therefore, even when various forces are applied to the attachment portion of the work machine, a configuration that can effectively distribute the forces has been desired.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a tractor that can effectively disperse the force received from the front work machine.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to an aspect of the present invention, a tractor having the following configuration is provided. That is, the tractor includes a main frame, a work implement support portion, and a rear frame. The work implement support portion is attached to the main frame and supports a work implement attached to a front portion of a vehicle body. The rear frame has a front end portion attached to the work implement support portion, a rear end portion attached to a rear axle case or the main frame, and is disposed below the main frame in a side view.

  That is, when working with a work machine attached to the front of the vehicle body, a torsional moment in the left-right direction of the vehicle body may be applied to the vehicle body due to the force from the work machine. In addition, when the work implement is rotated in the vertical direction, a vertical rotation moment may be applied to the work implement support portion. In this regard, in the above configuration, such a moment can be distributed not only to the main frame but also to the rear frame (and the place where the rear frame is fixed). In particular, by arranging the rear frame below the main frame, a structure in which a relatively large load is applied to the rear frame can be obtained. Therefore, the load on the tractor can be reduced.

  The tractor preferably includes a connection portion that connects the work implement support portions respectively provided on the left and right sides of the vehicle body below the main frame.

  Thereby, since a work implement support part is reinforced, the load concerning a tractor can be reduced. In particular, it is possible to reduce the influence of the force applied to the work implement support portion in the left and right outer direction of the vehicle body.

  In the tractor, the rear frame preferably has a bent portion that is bent in a plan view.

  Thus, even when a strong force is applied to the rear frame, the rear frame can be prevented from being damaged because the structure can be easily deformed to absorb the impact. Therefore, more load can be transmitted to the rear frame.

  The tractor preferably has the following configuration. That is, the tractor includes a footrest portion and a fuel tank. The footrest portion can place a driver's foot. The fuel tank is disposed below the footrest and above the rear frame.

  Thereby, since the rear frame is located below the fuel tank, the fuel tank can be prevented from being damaged by a protrusion on the ground or the like. Further, since the rear frame also serves as a protective member for the fuel tank, the number of parts can be reduced as compared with the case where the protective member is specially provided.

The perspective view which shows the whole structure of the tractor which concerns on one Embodiment of this invention. The bottom view of a tractor. The perspective view which shows a main frame and a rear frame. The perspective view explaining the attachment position of the front-end part of a rear frame. The perspective view explaining the attachment position of the rear-end part of a rear frame.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the overall configuration of the tractor 10 will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing an overall configuration of a tractor 10 according to an embodiment of the present invention. FIG. 2 is a bottom view of the tractor 10. In the following description, “left side”, “right side” and the like simply mean the left side and the right side in the direction in which the tractor 10 moves forward.

  The tractor 10 of the present embodiment is configured such that an appropriate work machine can be attached to the front part and the rear part. For example, a loader, a fork, etc. can be attached to the front part of this tractor 10, and a rotary etc. can be attached to the rear part. Below, the tractor 10 which attached the loader to the front part is demonstrated.

  As shown in FIG. 1, the tractor 10 includes a vehicle body 11, a front wheel 14, a rear wheel 15, a front loader 16, a cabin 17, and a three-point support mechanism 60 as main components.

  The vehicle body 11 includes an unillustrated engine housed in a hood 18 at the front. This engine can generate power by receiving fuel supplied from the fuel tank 41 shown in FIG. The power of the engine is transmitted to the front wheels 14 and the rear wheels 15 through an appropriate transmission mechanism. The front wheel 14 and the rear wheel 15 are rotated by the transmission of engine power, and can move the tractor 10. The vehicle body 11 also includes a main frame 12 at the lower part thereof.

  As shown in FIGS. 1 and 2, the main frame 12 is disposed in the lower part of the vehicle body 11 from the front part to the rear part of the vehicle body 11. Further, one rear frame (subframe) 13 is disposed on the left and right sides of the main frame 12 in the vehicle body outer side direction.

  An upper bracket 34 is attached to the main frame 12 and the rear frame 13 via a work implement support portion 30. A front loader 16 is attached to the upper end of the upper bracket 34. The detailed configurations of the main frame 12, the rear frame 13, and the work implement support unit 30 will be described later.

  The front loader 16 is a working machine for the purpose of loading earth and sand. The front loader 16 has a pair of booms 21 disposed on the left and right sides of the vehicle body 11, a lift cylinder 23 for moving the boom 21 up and down, a bucket 26 for scooping earth and sand, and the bucket 26. A dump cylinder 24. In the following description, the vehicle body rear side of the boom 21 is referred to as a proximal end side, and the vehicle body front side of the boom 21 is referred to as a distal end side.

  The boom 21 is configured in a shape extending toward the front of the tractor 10 while bending so as to draw an arc. The base end side of the boom 21 is rotatably connected to the upper portion of the upper bracket 34, and the distal end side is rotatably connected to the hitch 25.

  A cylinder receiving plate 27 is disposed at a substantially central portion in the longitudinal direction of the boom 21. A lift cylinder 23 is connected to an end portion on the base end side of the cylinder receiving plate 27, and a dump cylinder 24 is connected to an end portion on the distal end side. The lift cylinder 23 and the dump cylinder 24 are extended and contracted by supplying hydraulic oil to a port (not shown).

  In this configuration, when the lift cylinder 23 is extended, the boom 21 rotates upward, and the bucket 26 rises (see the two-dot chain line in FIG. 1). On the other hand, when the lift cylinder 23 is contracted, the boom 21 is rotated downward and the bucket 26 is lowered.

  Further, when the dump cylinder 24 is contracted, the hitch 25 is rotated clockwise in FIG. 1, and the bucket 26 is rotated upward (a scooping operation). On the other hand, when the dump cylinder 24 is extended, the hitch 25 rotates counterclockwise in FIG. 1, and the bucket 26 rotates downward (dump operation).

  A cabin 17 for the operator to board is arranged from the vicinity of the base end side of the boom 21 to the rear. The cabin 17 is provided with a driving operation tool, a driving seat, and the like, and is configured to operate the front loader 16 and travel the tractor 10 by operating the driving operation tool. .

  In addition, a three-point support mechanism 60 for attaching the work implement is disposed at the rear end portion of the tractor 10. As shown in FIGS. 1 and 2, the three-point support mechanism 60 includes a pair of left and right lower links 61 and a top link 62 disposed at a position higher than the lower links 61. .

  Next, the frame structure of the tractor 10 and the configuration of the work implement support unit 30 will be described in detail with reference to FIGS. FIG. 3 is a perspective view showing the main frame 12 and the rear frame 13. FIG. 4 is a perspective view for explaining the attachment position of the front end portion of the rear frame 13. In addition, since all the main frame 12, the rear frame 13, and the working machine support part 30 of this embodiment are comprised left-right symmetrically, below, only the structure of the left side may be demonstrated as a representative.

  The main frame 12 includes a pair of left and right side frames 12a extending in the front-rear direction of the tractor 10, and a front frame 12b that connects the front ends of the left and right side frames 12a. Further, a work machine support portion 30 that supports the load of the front loader 16 as a work machine is attached to the main frame 12.

  The work implement support unit 30 includes a mounting plate 31, a protruding cylinder 32, and a lower bracket 33.

  The mounting plate 31 is composed of a plate-like member having a certain thickness. While the central part of the mounting plate 31 is slightly bent, the rear part extends slightly downward. In addition, a plurality of holes are formed in the attachment plate 31, and the attachment plate 31 is attached to the side surface of the main frame 12 by inserting and fixing a fixing member such as a bolt into the holes. As a result, the load received by the mounting plate 31 can be transmitted to the main frame 12.

  Further, a portion extending below the left mounting plate 31 and a portion extending below the right mounting plate 31 are connected to each other by a support portion connecting member (connecting portion) 35. The support portion connecting member 35 is disposed slightly below the side frame 12a and is directed in the horizontal direction. In addition, a protruding cylinder 32 is attached to the surface on one side in the thickness direction of the mounting plate 31 and slightly behind the refracted portion of the mounting plate 31.

  The protruding cylinder 32 is a cylindrical member, and is provided so as to protrude horizontally from the mounting plate 31 to the outside of the vehicle body. The protruding cylinder 32 is formed in a straight line, and one end in the longitudinal direction is fixed to the mounting plate 31, and the other end is fixed to the lower bracket 33. Instead of the projecting cylinder 32, a cylindrical (solid) member, a member having a polygonal cross section, or the like can be used.

  As shown in FIGS. 3 and 4, the lower bracket 33 is fixed to the end of the protruding cylinder 32. The lower bracket 33 includes an upper extension portion 33a that extends upward from a location where it is fixed to the protruding cylinder 32, and a lower extension portion 33b that extends downward. Further, an upper bracket 34 shown in FIG. 4 is attached to an end of the upper extension portion 33a.

  The upper bracket 34 is a vertically elongated member, and the lower part thereof is connected to the lower bracket 33. At the upper end of the upper bracket 34, the boom 21 is rotatably attached. A lift cylinder 23 is rotatably attached to the front end portion of the upper bracket 34.

  Further, as described above, the rear frames 13 are arranged one by one on the left and right sides, and are formed so as to extend in the longitudinal direction of the tractor 10. As shown in FIG. 2, the rear frame 13 is disposed substantially parallel to the side frame 12a at portions other than the middle portion in the longitudinal direction (front end side and rear end side), and at the middle portion in the longitudinal direction. The side frame 12a is slightly inclined. In other words, the rear frame 13 is configured in a shape bent zigzag by two refracting portions (first refracting portion 13a and second refracting portion 13b).

  Since the refracting portions 13a and 13b are formed in this way, the refracting portions 13a and 13b are deformed even when a strong force is applied to the rear frame 13 in the left-right direction during the operation using the front loader 16. It is possible to prevent the rear frame 13 from being damaged by absorbing the shock. Further, even when a strong force in the longitudinal direction of the machine body is applied to the rear frame 13 during work using the front loader 16, the refracting portions 13a and 13b are deformed to absorb the impact and buckle the rear frame 13. Can be prevented.

  Next, the mounting position of the rear frame 13 and the devices arranged in the vicinity of the mounting position will be described. First, the configuration around the front end portion of the rear frame 13 will be described with reference to FIGS. 3 and 4.

  A plurality of mounting holes are formed at the front end of the rear frame 13. The rear frame 13 is attached to the lower bracket 33 by inserting and fixing a fixing tool such as a bolt into the attachment hole and the attachment hole formed in the lower extension portion 33 b of the lower bracket 33. Further, as shown in FIG. 4, a fuel tank 41 is disposed above the rear frame 13 and behind the lower bracket 33.

  As shown in FIG. 2, the fuel tank 41 has a portion that slightly protrudes to the outside (left side) of the vehicle body 11. As shown in FIG. 4, an oil supply port 41 a is provided on the upper portion of the protruding portion. And the tank protection board 42 is attached so that this protrusion part may be covered. Further, as shown in FIG. 2, a tank protection plate 42 is also attached to the front and rear portions of the fuel tank 41. With this configuration, the side surface of the protruding portion of the fuel tank 41 is protected by the tank protection plate 42, and the lower surface is protected by the tank protection plate 42 and the rear frame 13. Therefore, the fuel tank 41 is effectively prevented from being damaged and the fuel flowing out. Further, portions other than the protruding portion of the fuel tank 41 are disposed below a floor (footrest portion) 46 disposed inside the cabin 17.

  The floor 46 is for placing a foot when the operator sits on the driver's seat and performs operations. Further, when the pilot rides on the tractor 10 and goes up to the driver's seat, the step 46 and the floor 46 are sequentially stepped up like a staircase, so the floor 46 is a member for the pilot to go up to the driver's seat. It can be said.

  Next, with reference to FIG. 5, the attachment position of the rear end portion of the rear frame 13 and the devices arranged in the vicinity of the attachment position will be described. FIG. 5 is a perspective view for explaining the attachment position of the rear end portion of the rear frame 13. FIG. 5 shows a state in which the rear portion of the vehicle body 11 is viewed from the bottom side. In FIG. 5, components such as the rear wheel 15 are omitted for easy understanding of the drawing.

  As shown in FIG. 5, a transmission device for shifting the power transmitted from the engine is disposed at the rear of the vehicle body 11. This transmission device is disposed in the transmission case 51. The lower link 61 is attached to the left and right of the rear end of the transmission case 51, respectively. Further, rear axle cases 52 are respectively attached to the left and right side surfaces of the transmission case 51.

  The rear axle case 52 rotatably supports an output shaft (rear axle) for transmitting power transmitted from the engine to the rear wheel 15. A rear wheel 15 is arranged in the vehicle body outer side direction of the rear axle case 52. Further, a check chain bracket 53 is attached to the lower part of the rear axle case 52 (upper side in FIG. 5).

  The check chain bracket 53 is a member for attaching the check chain 54 and the rear frame 13. The check chain 54 is rotatably attached to a support plate 53 a fixed to the surface of the check chain bracket 53. The check chain 54 is connected to the lower link 61 at the opposite end.

  Further, a mounting hole is formed at the rear end of the rear frame 13 as shown in FIGS. The rear end connection plate 36 is attached to the surface of the rear frame 13 on the vehicle body center side by inserting and fixing a fixing tool such as a bolt into the attachment hole. In addition to the attachment holes for attachment to the rear frame 13, the rear end connection plate 36 is also provided with attachment holes for attachment to the support plate 53 a of the check chain bracket 53. The rear end connection plate 36 and the support plate 53a are fixed by inserting and fixing a fixing tool such as a bolt into the mounting hole and a mounting hole (not shown) formed in the support plate 53a. The rear frame 13 is attached to the rear axle case 52 as described above.

  With this configuration, a structure that can transmit the force received by the rear frame 13 from the front loader 16 or the like to the rear axle case 52 is realized.

  As shown in FIG. 1, the rear frame 13 is located below the main frame 12 in a side view. The force generated by the work using the front loader 16 is transmitted from the front loader 16 to the main frame 12 and the rear frame 13 via the upper bracket 34 and the work implement support unit 30. For this reason, when the force received from the front loader 16 is a rotational moment in the vertical direction, since the rear frame 13 is located below the main frame 12, the arm length of the moment is increased. Can transmit a lot of power. Therefore, load distribution can be performed efficiently and a stable configuration of the tractor 10 can be realized.

  As described above, the tractor 10 according to the present embodiment includes the main frame 12, the work implement support unit 30, and the rear frame 13. The work implement support unit 30 is attached to the main frame 12 and supports the front loader 16 as a work implement attached to the front portion of the vehicle body 11. The rear frame 13 has a front end portion attached to the work implement support portion 30 and a rear end portion attached to the rear axle case 52 via the rear end connection plate 36 and the check chain bracket 53. The rear frame 13 is disposed below the main frame 12 in a side view.

  That is, when working with the front loader 16 attached to the front portion of the vehicle body 11, a torsional moment in the lateral direction of the vehicle body 11 may be applied to the vehicle body 11 due to the force from the front loader 16. In addition, when the front loader 16 is rotated in the vertical direction, a rotational moment in the vertical direction may act on the work implement support unit 30. In this regard, in the above configuration, such a moment can be dispersed not only in the main frame 12 but also in the rear frame 13 (and the rear axle case 52 to which the rear frame 13 is attached). In particular, by arranging the rear frame 13 below the main frame 12, a structure in which the rear frame 13 receives a relatively large load can be obtained. Therefore, the load applied to the tractor 10 can be reduced. In addition, since the load acting on the mounting plate 31 is reduced, the mounting holes formed in the mounting plate 31 can be reduced, and the mounting work of the mounting plate 31 to the frame can be simplified.

  Further, the tractor 10 of the present embodiment includes support unit connecting members 35 that connect the work implement support units 30 respectively provided on the left and right sides of the vehicle body 11 at a position lower than the main frame 12.

  Thereby, since the working machine support part 30 is reinforced, the load applied to the tractor 10 can be reduced. Further, in the case where the front loader 16 is thrust into earth or sand, etc., there is a tendency that force is applied to the work implement support part 30 in the left and right outer direction of the vehicle body 11, but by the reinforcement by the support part connecting member 35, It is possible to reliably withstand the force in such a direction.

  Further, in the tractor 10 of the present embodiment, the rear frame 13 includes refracting portions 13a and 13b that are bent in a plan view.

  As a result, even when a strong force is applied to the rear frame 13, the rear frame 13 can be prevented from being damaged because the structure can be easily deformed to absorb the impact. Therefore, more load can be transmitted to the rear frame 13. In addition, since the present embodiment has a layout in which a relatively large load is applied to the rear frame 13, it is particularly preferable to prevent the rear frame 13 from being damaged by providing the above-described refracting portions 13a and 13b.

  Further, the tractor 10 of this embodiment includes a floor 46 and a fuel tank 41. The floor 46 is for the driver who is working to put his / her foot on, and also for the driver to put his / her foot on when he / she goes up to the driver's seat. The fuel tank 41 is disposed below the floor 46 and above the rear frame 13.

  Thereby, since the rear frame 13 is located below the fuel tank 41, the fuel tank 41 can be prevented from being damaged by a protrusion on the ground. Further, since the rear frame 13 is arranged below the fuel tank 41 in addition to the tank protection plate 42, the fuel tank 41 is more reliably protected.

  Although the embodiment of the present invention has been described above, the above configuration can be further modified as follows.

  In the above embodiment, the main frame 12 has a configuration in which the front end portions of the left and right side frames 12a are connected by the front frame 12b. However, the main frame 12 may be changed to a main frame having a configuration in which the front frame 12b is omitted. . Further, a frame (rectangular frame) having a structure in which not only the front end portion but also the rear end portion of the main frame are connected may be used as the main frame.

  In the above embodiment, the work implement support unit 30 includes the mounting plate 31, the protruding cylinder 32, and the lower bracket 33, but the work implement support unit 30 transmits the force from the front loader 16 to the main frame 12. Any configuration is possible, and the configuration is not limited to the above configuration. Further, the shape and arrangement of the mounting plate 31, the protruding cylinder 32, and the lower bracket 33 are not limited to the above configuration.

  In the above embodiment, the rear frame 13 includes the first refracting portion 13a and the second refracting portion 13b. However, the number and position of the refracting portions are not limited to the above configuration, and one or three refracting portions are provided. You may make it the structure which has two or more. Moreover, it can replace with the bending part which bends, and can also be set as the structure which has the curved part bent gently as a bending part.

  In the above embodiment, the rear end of the rear frame 13 is located behind the rear end of the main frame 12, but the positions and sizes of the main frame 12 and the rear frame 13 are not limited to the above configuration. For example, the rear end of the rear frame 13 may be positioned ahead of the rear end of the main frame 12.

  In the above embodiment, the rear frame 13 is supported by the rear axle case 52 via the rear end connection plate 36 and the check chain bracket 53. However, the rear frame 13 is supported by the rear axle case 52 via other appropriate members. Also good. Further, the main frame 12 may be extended to the rear side, and the extended portion and the rear frame 13 may be connected.

  In the above-described embodiment, the floor 46 has a configuration that serves as both a footrest for a pilot who is operating and a lifting unit when the operator gets on and off, but is disposed above the fuel tank 41. The floor 46 may have a configuration having only one of the functions.

DESCRIPTION OF SYMBOLS 10 Tractor 12 Main frame 13 Rear frame 13a 1st refraction part (bending part)
13b Second refraction part (curved part)
16 Front loader 30 Work implement support part 31 Mounting plate 32 Projection cylinder 33 Lower bracket 35 Support part connection member (connection part)
46 floor (foot rest)
52 Rear axle case 41 Fuel tank 53 Check chain bracket

Claims (4)

The mainframe,
A work implement support portion attached to the main frame and supporting a work implement attached to a front portion of the vehicle body;
A rear frame attached to the work implement support part, a rear end part attached to a rear axle case or the main frame, and disposed below the main frame in a side view;
A tractor comprising: The tractor according to claim 1,
A tractor comprising: a connecting portion that connects the work implement support portions provided on the left and right sides of the vehicle body below the main frame. The tractor according to claim 1 or 2,
The rear frame has a bent portion that is bent in a plan view. A tractor according to any one of claims 1 to 3,
A footrest portion on which a pilot's foot can be placed;
A fuel tank disposed below the footrest and above the rear frame;
A tractor comprising:

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